const digitsRe = /(\d(3))(?=\d)/g

/**
 * 
 * @param {Number} value
 * 
 */
// 价格计算
export function factPrice(value, discount) {
    value = parseFloat(value);
    discount = parseFloat(discount);
    if (!discount) return value;
    return value * discount;
}

export function currency(value, currency, decimals) {
    value = parseFloat(value);
    if (!isFinite(value) || (!value && value !== 0)) return '';
    currency = currency != null ? currency : '￥';
    decimals = decimals != null ? decimals : 2;
    var stringified = Math.abs(value).toFixed(decimals);
    var _int = decimals ? stringified.slice(0, -1 - decimals) : stringified;
    var i = _int.length % 3;
    var head = i > 0 ? (_int.slice(0, i) + (_int.length > 3 ? ',' : '')) : '';
    var _float = decimals ? stringified.slice(-1 - decimals) : '';
    var sign = value < 0 ? '-' : '';
    return sign + currency + head + _int.slice(i).replace(digitsRe, "$1,") + _float;
}